How should a positive tuberculin skin test be interpreted in high-risk individuals?

How should a positive tuberculin skin test be interpreted in high-risk individuals?

• A. It confirms active TB immediately.
• B. It indicates possible TB infection and requires further evaluation.
• C. It indicates immunity; no further action is needed.
• D. It is irrelevant to TB management.

Answer: (B)

A positive tuberculin skin test in someone at high risk signals TB infection exposure but does not prove that TB is active. The test shows that the immune system has been sensitized to TB antigens, but it cannot distinguish latent infection from active disease. Because high-risk individuals are more likely to progress from infection to active TB, a positive result requires a thorough evaluation to determine infection status and guide management. This evaluation includes checking for TB symptoms, obtaining a chest radiograph, and performing microbiologic tests (such as sputum smear and culture) if indicated. If active disease is not found, the person may be considered for treatment of latent TB infection to prevent progression. In short, a positive result indicates possible infection and necessitates further assessment rather than confirming active TB or immunity.

A positive tuberculin skin test in someone at high risk signals TB infection exposure but does not prove that TB is active. The test shows that the immune system has been sensitized to TB antigens, but it cannot distinguish latent infection from active disease. Because high-risk individuals are more likely to progress from infection to active TB, a positive result requires a thorough evaluation to determine infection status and guide management. This evaluation includes checking for TB symptoms, obtaining a chest radiograph, and performing microbiologic tests (such as sputum smear and culture) if indicated. If active disease is not found, the person may be considered for treatment of latent TB infection to prevent progression. In short, a positive result indicates possible infection and necessitates further assessment rather than confirming active TB or immunity.